FullStory is a vastly better offering than Inspectlet IMO. I rarely see a feature done as poorly as Inspectlet's search/filtering is. Just absolutely terrible. Don't know if I'm the only one on that, or what. If this is half as good though it may be a replacement for both.
I don't have any experience with FullStory or Inspectlet, haven't heard of.
Whole idea about this tool is just attempt to automate `some` of tester's jobs, in example - save scenario, run it again some time later, ideally automate it with selenium/jasmine.